<?php
// pass by value 

function addTwoElement($n1, $n2){
	$n1 = ($n1 + $n2);			
	echo $n1;
}

$arg1 = 100 ;		
$arg2 = 200 ; 
echo addTwoElement($arg1, $arg2),"<br>";
echo "arg1 = ".$arg1; 
?>